CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip
CVE-2026-55453 is fixed in 15 products on 1 platform, first by ALAS2023-2026-3415, released November 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A malicious or attacker-controlled IPP printer can return a crafted text printer-status attribute, such as marker-message, containing embedded newline characters. The CUPS ipp backend reports this remote printer attribute to the scheduler through the backend stderr/status stream. The current quoting helper escapes quotes and backslashes, but it does not reject or encode LF/CR. As a result, attacker-controlled printer status text can create a new backend status line beginning with PPD:.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cups · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-client · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-client-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-debugsource · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-devel · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-filesystem · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-ipptool · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-ipptool-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-libs · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-libs-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-lpd · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-lpd-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-printerapp · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
| cups-printerapp-debuginfo · amzn 2023 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 | Nov 10, 2026 |
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